Add Sentry.Extensions.AI with AI Agents Insights

[bruno-garcia]

Resolves: #3762

See: https://docs.sentry.io/product/insights/ai/agents/
And: https://develop.sentry.dev/sdk/telemetry/traces/modules/ai-agents/

[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

- Add Sentry.Extensions.AI with AI Agents Insights ([#4420](https://github.com/getsentry/sentry-dotnet/pull/4420))

If none of the above apply, you can opt out of this check by adding #skip-changelog to the PR description or adding a skip-changelog label.

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